| 摘要 |
The present invention is the emission of new sonic or subsonic compression waves from a resonant cavity (80) as a result of interference of at least tw o ultrasonic wave trains (30, 32). In one embodiment, two ultrasonic emitters (20) are oriented toward the cavity. When the difference in frequency betwee n the two ultrasonic wave trains is in the sonic or subsonic frequency range, a new sonic or subsonic wave train of that frequency is emitted from within th e cavity or region of interference in accordance with the principles of acoustical heterodyning. The preferred embodiment is a system comprised of a single ultrasonic radiating element oriented toward the cavity emitting multiple waves.
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